This function will split up your program into files that the AutoLoader
module can handle. It is used by both the standard perl libraries and by
the MakeMaker utility, to automatically configure libraries for
autoloading.

The autosplit interface splits the specified file into a hierarchy rooted at the
directory $dir. It creates directories as needed to reflect class hierarchy, and creates
the file autosplit.ix. This file acts as both forward declaration of all package routines, and
as timestamp for the last update of the hierarchy.

The remaining three arguments to autosplit govern other options to the autosplitter.

The fourth argument, $check, instructs autosplit to check the module currently being split to ensure that it does include a use
specification for the AutoLoader module, and skips the module if AutoLoader
is not detected. $check defaults to 1.

Lastly, the $modtime argument specifies that autosplit is to check the modification time of the module against that of the autosplit.ix file, and only split the module if it is newer. $modtime
defaults to 1.

Typical use of AutoSplit in the perl MakeMaker utility is via the
command-line with:

perl -e 'use AutoSplit; autosplit($ARGV[0], $ARGV[1], 0, 1, 1)'

Defined as a Make macro, it is invoked with file and directory arguments;
autosplit will split the specified file into the specified directory and delete
obsolete .al files, after checking first that the module does use the AutoLoader, and
ensuring that the module is not already currently split in its current form
(the modtime test).

The autosplit_lib_modules form is used in the building of perl. It takes as input a list of files
(modules) that are assumed to reside in a directory
lib relative to the current directory. Each file is sent to the autosplitter
one at a time, to be split into the directory lib/auto.

In both usages of the autosplitter, only subroutines defined following the
perl __END__ token are split out into separate files. Some routines may be placed prior
to this marker to force their immediate loading and parsing.

AutoSplit will inform the user if it is necessary to create the top-level directory
specified in the invocation. It is preferred that the script or
installation process that invokes AutoSplit have created the full directory path ahead of time. This warning may
indicate that the module is being split into an incorrect path.

AutoSplit will warn the user of all subroutines whose name causes potential file
naming conflicts on machines with drastically limited (8 characters or
less) file name length. Since the subroutine name is used as the file name,
these warnings can aid in portability to such systems.

Warnings are issued and the file skipped if AutoSplit cannot locate either the __END__ marker or a ``package Name;''-style specification.

AutoSplit will also emit general diagnostics for inability to create directories or
files.

When putting a smiley right before a closing parenthesis, do you:

Use two parentheses: (Like this: :) )
Use one parenthesis: (Like this: :)
Reverse direction of the smiley: (Like this: (: )
Use angle/square brackets instead of parentheses
Use C-style commenting to set the smiley off from the closing parenthesis
Make the smiley a dunce: (:>
I disapprove of emoticons
Other